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    Practical microwave induction automatic opening circuit analysis

     

    The above figure shows a microwave induction automatic opening circuit. In this circuit, after the power is turned on, the ICI's antenna transmits a microwave signal. When the person enters the detection zone, the signal of the human body reflected by the antenna will have a phase difference between the transmit and the received signal, and the circuit will be phase The differential detection becomes the signal of the drive operational amplifier by the @ foot of the IC1. After IC2 treatment, a pulse signal triggered two-way thyristors is formed, and the thyristor is turned on, the electric lamp is lit. When people leave the detection area, there is no signal output, and the light is automatically extinguished.

     

     

     

     

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